So, Medal of Honer is a Quake 3 game and I have noticed that for some reason lot of Q3 games have issue with mice that use a high polling rate. These are usually laser gaming mice with adjustable dpi. But it's not the dpi; it's the polling rate.

so here's a simple fix if you're getting any kind of weird behavior from your mouse.

1. disable enhanced pointer precision in Windows

2. set your polling rate you to to a lower setting I use 333 with my Logitech mouse